What is CDR? CorelDRAW File Format Explained
Corel's proprietary native vector graphics format for the CorelDRAW illustration suite.
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What is CDR?
CDR is the proprietary native file format of CorelDRAW, the vector graphics editor developed by Corel Corporation and first released in 1989. It stores vector illustrations including lines, curves, shapes, text, color and layout information for editing within the CorelDRAW suite.
The internal structure of CDR has changed across versions. Early releases used a private binary layout, while from CorelDRAW 3 the file adopted a RIFF container identified by a 'RIFF' signature. From version X4 onward a CDR file is a ZIP archive containing XML files and RIFF-structured data, though the core graphics chunk remains a proprietary, undocumented Corel format.
How CDR Stores Artwork
CDR preserves a full editable scene: vector paths, shapes, text, color definitions, and layer and layout information used by the CorelDRAW suite.[1] Because it is the application's native working format, it retains editing state that flattened export formats discard.
History and Format Evolution
CorelDRAW debuted in 1989, and its file structure changed substantially across releases.[1] Early versions used a private binary layout; from CorelDRAW 3 the file moved to a RIFF container, and from version X4 onward a CDR is a ZIP archive bundling XML files alongside RIFF-structured data.[2]
Limitations and Interoperability
Despite the shift to ZIP and XML wrappers, the core graphics chunk remains a proprietary, undocumented Corel structure, so faithful reading outside Corel software depends on reverse-engineering efforts.[2] This makes long-term archival and cross-tool exchange less reliable than with openly specified vector formats.[1]
MKV Technical Specifications
CDR vs Other Image Formats
| Feature | CDR | SVG | AI | EPS |
|---|---|---|---|---|
| Type | Vector[1] | Vector | Vector | Vector |
| Owner | Corel[1] | W3C | Adobe | Adobe |
| Specification | Proprietary[2] | Open | Proprietary | Open (PostScript) |
| App support | Mainly CorelDRAW[1] | Universal | Adobe + many | Wide |
| Browser support | None | Universal | None | None |
| Best for | CorelDRAW projects | Web vector graphics | Illustrator artwork | Print graphics |
CDR is CorelDRAW's proprietary working format with limited support outside Corel software, whereas SVG and EPS offer more interchangeable vector storage.
Advantages & Disadvantages
Advantages
As the native format, CDR preserves all editable CorelDRAW data including layers, effects, styles and precise vector geometry.
CDR stores artwork as vectors, so designs can be resized to any dimension without loss of quality.
The format retains advanced illustration features used in signmaking, print and engraving workflows that flat exports may discard.
Modern CDR files use RIFF and ZIP containers, bundling artwork, XML metadata and resources in a single document.
Disadvantages
Corel has never published an official specification, so the core data chunk must be reverse-engineered by third-party tools.
Many applications cannot reliably open CDR, and import support in tools like Inkscape or Illustrator can be incomplete or version-dependent.
Newer CDR versions are not always readable by older CorelDRAW releases or other software.
Common Use Cases
CDR is used wherever CorelDRAW is the primary design tool, especially in production art.
Sign and print production | FileFormer
CDR is widely used in signmaking, large-format printing and prepress where CorelDRAW is a common production tool.
Vinyl cutting and engraving | FileFormer
Vector CDR paths drive cutting plotters, laser engravers and CNC workflows that need precise outlines.
Logo and illustration design | FileFormer
Designers store editable logos, illustrations and layouts as CDR to keep all CorelDRAW editing capabilities.
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Try Image Converter FreeFrequently Asked Questions
Is CDR a vector format?
Yes. CDR is primarily a vector graphics format, though it can also embed raster images within a design.
What program opens CDR files?
CorelDRAW is the native application. Some third-party tools such as Inkscape and LibreOffice Draw can import CDR with varying fidelity.
Is the CDR format documented?
No official public specification exists. Community projects have reverse-engineered parts of the format, but the core data remains proprietary.
How has the CDR file structure changed?
Early versions used a private binary layout, CorelDRAW 3 introduced a RIFF container, and from X4 onward CDR files are ZIP archives containing XML and RIFF data.
Can I convert CDR to a more open format?
Yes. CorelDRAW and some third-party tools can export CDR to interoperable formats such as SVG, PDF, EPS or PNG.